The compressibility of Fe- and Al-bearing phase D to 30 GPa
The compressibility of Fe- and Al-bearing phase D to 30 GPa
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DOI：
10.1007/s00269-006-0136-4
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发表时间：
2007-04-01
影响因子：
1.4
通讯作者：
Funakoshi, Kenichi
中科院分区：
文献类型：
--
作者：
Litasov, Konstantin D.;Ohtani, Eiji;Funakoshi, Kenichi
High-pressure in situ X-ray diffraction experiment of Fe- and Al-bearing phase D (Mg0.89Fe0.14Al0.25Si1.56H2.93O6) has been carried out to 30.5 GPa at room temperature using multianvil apparatus. Fitting a third-order Birch - Murnaghan equation of state to the P - V data yields values of V-0 = 86.10 +/- 0.05 angstrom(3); K-0 = 136.5 +/- 3.3 GPa and K' = 6.32 +/- 0.30. If K' is fixed at 4.0 K-0 = 157.0 +/- 0.7 GPa, which is 6% smaller than Fe - Al free phase D reported previously. Analysis of axial compressibilities reveals that the c-axis is almost twice as compressible (K-c = 93.6 +/- 1.1 GPa) as the a-axis (K-a = 173.8 +/- 2.2 GPa). Above 25 GPa the c/a ratio becomes pressure independent. No compressibility anomalies related to the structural transitions of H-atoms were observed in the pressure range to 30 GPa. The density reduction of hydrated subducting slab would be significant if the modal amount of phase D exceeds 10%.
